\n\n810g for 27.2mm\n\n815g for 28.6mm\n\n820g for 30.0mm\n\n830g for 30.4mm\n\n835g for 30.8mm\n\n840g for 30.9mm\n\n875g for 31.6mm\n\n?Cycling Experience?The widely used model SP12-NCX/SP17-NCX from a certain brand often results in a forward-backward displacement of the rider's center of gravity during cycling, leading to discomfort during prolonged rides. In contrast, our suspension system adopts a verticalized design, ensuring the rider's center of gravity remains consistently perpendicular to the ground. This guarantees a constant riding posture, providing a more comfortable experience for the cyclist.\n\n?Certification? ISO4210/EN15194\n\nFull compatible with sr Suntour ncx Sp12/sp17, Aventon, lectric xp 3.0/ 2.0/1.0 Xp lite xpress xpedition trike